what is Social media marketing?

Social media marketing is the use of social media platforms and websites to promote a product or service. Although the terms e-marketing and digital marketing are still dominant in academia, social media marketing is becoming more popular for both practitioners and researchers. Most social media platforms have built-in data analytics tools, enabling companies to track the progress, success, and engagement of ad campaigns. Companies address a range of stakeholders through social media marketing, including current and potential customers, current and potential employees, journalists, bloggers, and the general public.

 On a strategic level, social media marketing includes the management of a marketing campaign, governance, setting the scope (e.g. more active or passive use), and the establishment of a firm's desired social media "culture" and "tone."

When using social media marketing, firms can allow customers and Internet users to post user-generated content (e.g., online comments, product reviews, etc.), also known as "earned media," rather than use marketer-prepared advertising copy.

Ref: Wikipedia